1. There also is Ephemeris time , which may include overlapping information. 2. D Brouwer suggested the name'ephemeris time '. 3. The length of second so defined was practically equal to the second of ephemeris time . 4. In view of the fluctuation term, practical determination of the difference between ephemeris time and UT depended on observation. 5. When ephemeris time was first adopted, time scales were still based on astronomical observation, as they always had been. 6. Clemence's formula, now superseded by more modern estimations, was included in the original conference decision on ephemeris time . 7. In this way, decisions made by the original designers of ephemeris time influenced the length of today's mean solar time. 8. The difference between Terrestrial Time ( TT ) ( the successor to ephemeris time ) and atomic time was later defined as follows: 9. He developed the ephemeris time scale, which had been adopted by the Hz, was used to define the second internationally since 1967. 10. A detailed proposal of this kind was published in 1948 and adopted by the IAU in 1952 ( see Ephemeris time -history ).
